Hi and welcome to MM
Have you had a hysterectomy? If you have, then you only need oestrogen and not combined HRT with both oestrogen and progesterone. If you started the Elleste soon after you hysterectomy then you may be needing a higher dose of oestrogen by now. If you still had your ovaries and they have now started to fail, then it could be that you are now deeper into menopause so needing a higher dose of oestrogen.
How old are you? You may do better with transdermal oestrogen e.g. Oestrogel or oestrogen patches, as these can often absorb better. I'm afraid the menopause can really ‘mess with our heads' and HRT alone is often not enough.
Getting all lifestyle issues in order - so a good diet and exercise regime and practise relaxation techniques regularly - are essential at this time in our lives.
If you did have a hysterectomy fairly recently, then you are recovering from surgery and this can have a great effect on your body - so be kind to yourself.
Breast pain with any hormone treatment is common and should settle in time as the body adjusts and settles.
I would ask to try Estrodot patches and go for a medium dose(50mcg) and see if this improves things.
Here is the link to the oestrogen options under the TREATMENTS section on this site:
https://www.menopausematters.co.uk/treatafter.phpDG x